How the cable is installed drastically changes its ability to cool.
[ A = \frac\sqrtI_sc^2 \times tk ]
Note: These are rough guides for typical applications. Always consult local codes.
Calculate VD for the one-way length. If exceeding 3% (branch) or 5% (total), increase cable size.
If ambient ≠ 30°C (86°F), multiply ampacity by factor.